// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#if V8_TARGET_ARCH_X64

#include "src/interface-descriptors.h"

#include "src/frames.h"
#include "src/property-details.h"
#include "src/objects-inl.h"
#include "src/objects/fixed-array.h"
#include "src/objects/fixed-array-inl.h"

namespace v8 {
namespace internal {

    const Register CallInterfaceDescriptor::ContextRegister() { return rsi; }

    void CallInterfaceDescriptor::DefaultInitializePlatformSpecific(
        CallInterfaceDescriptorData* data, int register_parameter_count)
    {
        const Register default_stub_registers[] = { rax, rbx, rcx, rdx, rdi };
        CHECK_LE(static_cast<size_t>(register_parameter_count),
            arraysize(default_stub_registers));
        data->InitializePlatformSpecific(register_parameter_count,
            default_stub_registers);
    }

    void RecordWriteDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        const Register default_stub_registers[] = { arg_reg_1, arg_reg_2, arg_reg_3,
            arg_reg_4, kReturnRegister0 };

        data->RestrictAllocatableRegisters(default_stub_registers,
            arraysize(default_stub_registers));

        CHECK_LE(static_cast<size_t>(kParameterCount),
            arraysize(default_stub_registers));
        data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
    }

    void EphemeronKeyBarrierDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        const Register default_stub_registers[] = { arg_reg_1, arg_reg_2, arg_reg_3,
            arg_reg_4, kReturnRegister0 };

        data->RestrictAllocatableRegisters(default_stub_registers,
            arraysize(default_stub_registers));

        CHECK_LE(static_cast<size_t>(kParameterCount),
            arraysize(default_stub_registers));
        data->InitializePlatformSpecific(kParameterCount, default_stub_registers);
    }

    const Register FastNewFunctionContextDescriptor::ScopeInfoRegister()
    {
        return rdi;
    }
    const Register FastNewFunctionContextDescriptor::SlotsRegister() { return rax; }

    const Register LoadDescriptor::ReceiverRegister() { return rdx; }
    const Register LoadDescriptor::NameRegister() { return rcx; }
    const Register LoadDescriptor::SlotRegister() { return rax; }

    const Register LoadWithVectorDescriptor::VectorRegister() { return rbx; }

    const Register StoreDescriptor::ReceiverRegister() { return rdx; }
    const Register StoreDescriptor::NameRegister() { return rcx; }
    const Register StoreDescriptor::ValueRegister() { return rax; }
    const Register StoreDescriptor::SlotRegister() { return rdi; }

    const Register StoreWithVectorDescriptor::VectorRegister() { return rbx; }

    const Register StoreTransitionDescriptor::SlotRegister() { return rdi; }
    const Register StoreTransitionDescriptor::VectorRegister() { return rbx; }
    const Register StoreTransitionDescriptor::MapRegister() { return r11; }

    const Register ApiGetterDescriptor::HolderRegister() { return rcx; }
    const Register ApiGetterDescriptor::CallbackRegister() { return rbx; }

    const Register GrowArrayElementsDescriptor::ObjectRegister() { return rax; }
    const Register GrowArrayElementsDescriptor::KeyRegister() { return rbx; }

    void TypeofDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = { rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    // static
    const Register TypeConversionDescriptor::ArgumentRegister() { return rax; }

    void CallTrampolineDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments
        // rdi : the target to call
        Register registers[] = { rdi, rax };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void CallVarargsDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments (on the stack, not including receiver)
        // rdi : the target to call
        // rcx : arguments list length (untagged)
        // rbx : arguments list (FixedArray)
        Register registers[] = { rdi, rax, rcx, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void CallForwardVarargsDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments
        // rcx : start index (to support rest parameters)
        // rdi : the target to call
        Register registers[] = { rdi, rax, rcx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void CallFunctionTemplateDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rdx: the function template info
        // rcx: number of arguments (on the stack, not including receiver)
        Register registers[] = { rdx, rcx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void CallWithSpreadDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments (on the stack, not including receiver)
        // rdi : the target to call
        // rbx : the object to spread
        Register registers[] = { rdi, rax, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void CallWithArrayLikeDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rdi : the target to call
        // rbx : the arguments list
        Register registers[] = { rdi, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ConstructVarargsDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments (on the stack, not including receiver)
        // rdi : the target to call
        // rdx : the new target
        // rcx : arguments list length (untagged)
        // rbx : arguments list (FixedArray)
        Register registers[] = { rdi, rdx, rax, rcx, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ConstructForwardVarargsDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments
        // rdx : the new target
        // rcx : start index (to support rest parameters)
        // rdi : the target to call
        Register registers[] = { rdi, rdx, rax, rcx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ConstructWithSpreadDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments (on the stack, not including receiver)
        // rdi : the target to call
        // rdx : the new target
        // rbx : the object to spread
        Register registers[] = { rdi, rdx, rax, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ConstructWithArrayLikeDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rdi : the target to call
        // rdx : the new target
        // rbx : the arguments list
        Register registers[] = { rdi, rdx, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ConstructStubDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        // rax : number of arguments
        // rdx : the new target
        // rdi : the target to call
        // rbx : allocation site or undefined
        Register registers[] = { rdi, rdx, rax, rbx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void AbortDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = { rdx };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void AllocateHeapNumberDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        data->InitializePlatformSpecific(0, nullptr);
    }

    void CompareDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = { rdx, rax };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void BinaryOpDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = { rdx, rax };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ArgumentsAdaptorDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            rdi, // JSFunction
            rdx, // the new target
            rax, // actual number of arguments
            rbx, // expected number of arguments
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ApiCallbackDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            rdx, // api function address
            rcx, // argument count (not including receiver)
            rbx, // call data
            rdi, // holder
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void InterpreterDispatchDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            kInterpreterAccumulatorRegister, kInterpreterBytecodeOffsetRegister,
            kInterpreterBytecodeArrayRegister, kInterpreterDispatchTableRegister
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void InterpreterPushArgsThenCallDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            rax, // argument count (not including receiver)
            rbx, // address of first argument
            rdi // the target callable to be call
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void InterpreterPushArgsThenConstructDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            rax, // argument count (not including receiver)
            rcx, // address of first argument
            rdi, // constructor to call
            rdx, // new target
            rbx, // allocation site feedback if available, undefined otherwise
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void ResumeGeneratorDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            rax, // the value to pass to the generator
            rdx // the JSGeneratorObject / JSAsyncGeneratorObject to resume
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void FrameDropperTrampolineDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = {
            rbx, // loaded new FP
        };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

    void RunMicrotasksEntryDescriptor::InitializePlatformSpecific(
        CallInterfaceDescriptorData* data)
    {
        Register registers[] = { arg_reg_1, arg_reg_2 };
        data->InitializePlatformSpecific(arraysize(registers), registers);
    }

} // namespace internal
} // namespace v8

#endif // V8_TARGET_ARCH_X64
